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QUEST DIAGNOSTICS INC

Canonical company identity and public leadership record.

https://registry.alpha.ac/companies/quest-diagnostics-inc

Entity: Public listing published
Primary listing: NYSE: DGX
Verification: Partially verified
Last reviewed: 2026-10-15T04:45:20.170332+00:00

Overview

Alpha's canonical identity and public leadership record for Quest Diagnostics.

Canonical AEGIS identity graph

Executive leadership

Current, confirmed roles are shown only when both the person Profile and supporting source record satisfy the public projection boundary. A missing role is not evidence that it does not exist.

Executive team

7 public records

Catherine T. Doherty

Executive Vice President, Regional Businesses

State: confirmed
Effective: From Feb 26, 2026
Confidence: 94%
Evidence: DGX 10-K executive officersFeb 26, 2026

Chairman, Chief Executive Officer and President

State: confirmed
Effective: From Feb 26, 2026
Confidence: 94%
Evidence: DGX 10-K executive officersFeb 26, 2026

Karthik Kuppusamy

Senior Vice President, Clinical Solutions

State: confirmed
Effective: From Feb 26, 2026
Confidence: 94%
Evidence: DGX 10-K executive officersFeb 26, 2026

Mark E. Delaney

Senior Vice President and Chief Commercial Officer

State: confirmed
Effective: From Feb 26, 2026
Confidence: 94%
Evidence: DGX 10-K executive officersFeb 26, 2026

Michael E. Prevoznik

Senior Vice President and General Counsel

State: confirmed
Effective: From Feb 26, 2026
Confidence: 94%
Evidence: DGX 10-K executive officersFeb 26, 2026

Patrick Plewman

Senior Vice President, Diagnostics Services

State: confirmed
Effective: From Feb 26, 2026
Confidence: 94%
Evidence: DGX 10-K executive officersFeb 26, 2026

Executive Vice President and Chief Financial Officer

State: confirmed
Effective: From Feb 26, 2026
Confidence: 94%
Evidence: DGX 10-K executive officersFeb 26, 2026

Governance leadership

Boards & Committees

Board and committee assignments appear only when the canonical public projection retains a current role and supporting source. Unpublished records are not interpreted as absence.

Record as of Oct 15, 2026. Chair, executive office, Lead Independent Director and committee appointments retain their separate source roles. A complete board composition denominator and committee charters are not established by a partial roster.

Board roles

11 public records

Director

Board chairNot independentExecutive

State: unconfirmed
Effective: From Jan 1, 2022
Confidence: 85%
Evidence: Quest Diagnostics Incorporated DEF 14A 2026-04-06Apr 6, 2026

Timothy L. Main

Director

Board chairIndependentAudit and FinanceCybersecurityGovernanceTechnology · Chair

State: unconfirmed
Effective: From Jan 1, 2014
Confidence: 85%
Evidence: Quest Diagnostics Incorporated DEF 14A 2026-04-06Apr 6, 2026

Denise M. Morrison

Director

IndependentCompensation and Leadership Development · ChairCybersecurityGovernanceTechnology

State: unconfirmed
Effective: From Jan 1, 2019
Confidence: 85%
Evidence: Quest Diagnostics Incorporated DEF 14A 2026-04-06Apr 6, 2026

Gary M. Pfeiffer

Director

IndependentAudit and Finance · ChairCompensation and Leadership DevelopmentExecutiveGovernance

State: unconfirmed
Effective: From Jan 1, 2004
Confidence: 85%
Evidence: Quest Diagnostics Incorporated DEF 14A 2026-04-06Apr 6, 2026

Luis A. Diaz, Jr., M.D.

Director

Independent

State: unconfirmed
Effective: From Jan 1, 2023
Confidence: 85%
Evidence: Quest Diagnostics Incorporated DEF 14A 2026-04-06Apr 6, 2026

Director

IndependentAudit and FinanceCybersecurityTechnology

State: unconfirmed
Effective: From Jan 1, 2024
Confidence: 85%
Evidence: Quest Diagnostics Incorporated DEF 14A 2026-04-06Apr 6, 2026

Timothy C. Wentworth

Director

IndependentCompensation and Leadership DevelopmentQuality and Compliance

State: unconfirmed
Effective: From Jan 1, 2026
Confidence: 85%
Evidence: Quest Diagnostics Incorporated DEF 14A 2026-04-06Apr 6, 2026

Timothy M. Ring

Director

IndependentCompensation and Leadership DevelopmentExecutiveGovernance · Chair

State: unconfirmed
Effective: From Jan 1, 2011
Confidence: 85%
Evidence: Quest Diagnostics Incorporated DEF 14A 2026-04-06Apr 6, 2026

Director

IndependentAudit and FinanceQuality and Compliance

State: unconfirmed
Effective: From Jan 1, 2021
Confidence: 85%
Evidence: Quest Diagnostics Incorporated DEF 14A 2026-04-06Apr 6, 2026

Director

IndependentCompensation and Leadership DevelopmentGovernanceQuality and Compliance

State: unconfirmed
Effective: From Jan 1, 2014
Confidence: 85%
Evidence: Quest Diagnostics Incorporated DEF 14A 2026-04-06Apr 6, 2026

Wright L. Lassiter III

Director

IndependentAudit and FinanceQuality and Compliance

State: unconfirmed
Effective: From Jan 1, 2020
Confidence: 85%
Evidence: Quest Diagnostics Incorporated DEF 14A 2026-04-06Apr 6, 2026

Committees

7 public records

Membership and chair roles are projected from current board seats. A chair is shown only when a stored chair flag says so.

Audit and Finance

Chair: Gary M. Pfeiffer
Members: Gary M. Pfeiffer (Chair); Robert Carter; Timothy L. Main; Tracey C. Doi; Wright L. Lassiter III

Compensation and Leadership Development

Chair: Denise M. Morrison
Members: Denise M. Morrison (Chair); Gary M. Pfeiffer; Timothy C. Wentworth; Timothy M. Ring; Vicky B. Gregg

Cybersecurity

Chair: Not stated
Members: Denise M. Morrison; Robert Carter; Timothy L. Main

Executive

Chair: Not stated
Members: Gary M. Pfeiffer; James E. Davis; Timothy M. Ring

Governance

Chair: Timothy M. Ring
Members: Timothy M. Ring (Chair); Denise M. Morrison; Gary M. Pfeiffer; Timothy L. Main; Vicky B. Gregg

Quality and Compliance

Chair: Not stated
Members: Timothy C. Wentworth; Tracey C. Doi; Vicky B. Gregg; Wright L. Lassiter III

Technology

Chair: Timothy L. Main
Members: Timothy L. Main (Chair); Denise M. Morrison; Robert Carter

Source record

Alpha canonical company public projection

Supports Company identity, Published leadership, Entity status boundary

Reviewed 2026-10-15T04:45:20.170332+00:00

QUEST DIAGNOSTICS INC Form 10-K (filed 2026-02-26)

Supports Official website

Reviewed 2026-08-29T22:26:50Z